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Aleonysh [2.5K]
3 years ago
14

Janet claims that her dog can do simple addition problems. She showed her dog 8 different cards with simple addition problems, a

nd the dog was able to tap his paw to indicate whether the answer was correct or incorrect. The dog correctly identified all 8 cards. Alex didn't believe Janet's dog could do addition, so he set up a trial to test whether the dog was just guessing. He flipped 8 coins to see how many would land tails up. He did this 53 times, and the results are shown in the dot plot below: Based on these results, can Janet's dog add?
A)Yes, the chances of getting 8 correct by guessing are very low
B)No, the chances of getting 8 correct by guessing are very low
C)Yes, the dog is likely to get them all correct
D)No, dogs can't add

Mathematics
1 answer:
ki77a [65]3 years ago
7 0

Answer:  A

Step-by-step explanation:

i got it right in flvs

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Answer:

The equation would be 4x-15=21.

Step-by-step explanation:

Given;

Total Number of Video games = 21

Let the number of video game Nicholas has be 'x'.

Now Given:

Robert has 5 fewer games than Nicholas.

so we can say that;

number of video game Robert has = x-5

Also Given:

Charlie has twice as many games as Robert.

so we can say that;

number of video game Charlie has = 2(x-5)=2x-10

we need to write the equation.

Solution:

Now we can say that;

Total Number of Video games is equal to sum of number of video game Nicholas has, number of video game Robert has and number of video game Charlie has.

framing the equation we get;

x+x-5+2x-10=21\\\\4x-15=21

Hence The equation would be 4x-15=21.

On Solving we get;

Adding both side by 15 we get;

4x-15+15=21+15\\\\4x=36

Dividing both side by 4 we get;

\frac{3x}{4}=\frac{36}{4}\\\\x=9

Hence Nicholas has = 9 video games

Robert has = x-5= 9-5=4 video games

Charlie has = 2x-10 = 2\times9-10=18-10=8 video games

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3 years ago
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Step-by-step explanation:

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